Trials is a different mode from the rest of Crucible. Showing that you've gone flawless before means there's a better chance that you have the right skill set for Trials. Teamwork, communication, getting revives, grappling for small positional advantages, and knowing when to challenge vs. when to retreat are all important parts of Trials, and normal Crucible K/D is not a good metric to demonstrate them. That said, I usually just say that I'm looking for one player who can communicate, play as part of a team, and (most importantly) isn't an asshole.